WebSphere eXtreme Scale Administration Guide > Plan application deployment > Tuning performance


ORB properties and file descriptor settings



ORB properties

The ORB is used by eXtreme Scale to communicate over a TCP stack. Properties are set in...

java/jre/lib/orb.properties file

For a heavy load of large objects, enable ORB fragmentation...

com.ibm.CORBA.FragmentSize=<right size>

Prevent ThreadPool growth by specifying the following setting:

com.ibm.CORBA.ThreadPool.IsGrowable=false

Set proper timeouts to avoid excess threads in an abnormal situation by specifying the following settings:


File descriptor

UNIX and Linux systems there is a limit to the number of open files allowed per process. The operating system specifies the number of open files permitted. If this value is set too low, a memory allocation error will occur on AIX, and too many files opened are logged.

In the UNIX system terminal window, set this value higher than the default system value. For large SMP machines with clones, set to unlimited.

For AIX configurations set this value to -1 (unlimited) with the command ulimit -n -1.

For Solaris configurations set this value to 16384 with the command ulimit -n 16384.

To display the current value use the command ulimit -a.



Parent topic

Tune performance


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